It simply means that a VPN doesn’t keep usage logs. In other words, no one, including your VPN provider, can see what you do while connected to a VPN. That includes your browsing history, used bandwidth, and network traffic.
No-logs policy is quite tricky to achieve since some countries force VPN services to store your data for at least some time. If you want the best data protection possible, check out VPNs that operate in jurisdictions without data collection laws.
Does Surfshark keep logs?
In short, Surfshark VPN does not keep track of your online whereabouts or actions in any way. The VPN server only keeps enough data to maintain your VPN connection, and nothing is kept after you’re done.